Add asset system with file locking and atomic writes

2 files changed, 62 insertions, 0 deletions

diff --git a/systems/asset/test/Cargo.toml b/systems/asset/test/Cargo.toml
new file mode 100644
index 0000000..07c6282
--- /dev/null
+++ b/systems/asset/test/Cargo.toml
@@ -0,0 +1,9 @@
+[package]
+name = "asset_test"
+version.workspace = true
+edition = "2024"
+
+[dependencies]
+asset = { path = "../" }
+
+tokio = { version = "1.48.0", features = ["full"] }
diff --git a/systems/asset/test/src/lib.rs b/systems/asset/test/src/lib.rs
new file mode 100644
index 0000000..79a840d
--- /dev/null
+++ b/systems/asset/test/src/lib.rs
@@ -0,0 +1,53 @@
+use std::path::PathBuf;
+
+use asset::{
+    RWDataTest, ensure_eq,
+    error::{DataReadError, DataWriteError},
+    rw::RWData,
+};
+
+#[derive(RWDataTest)]
+pub struct FooData {
+    pub age: i32,
+    pub name: String,
+}
+
+impl RWData<FooData> for FooData {
+    type DataType = FooData;
+
+    async fn read(path: &PathBuf) -> Result<FooData, DataReadError> {
+        let content = tokio::fs::read_to_string(path)
+            .await
+            .map_err(|e| DataReadError::IoError(e))?;
+        let parts: Vec<&str> = content.split('=').collect();
+        if parts.len() != 2 {
+            return Err(DataReadError::ParseError("Invalid format".to_string()));
+        }
+        let name = parts[0].to_string();
+        let age: i32 = parts[1]
+            .parse()
+            .map_err(|_| DataReadError::ParseError("Invalid age".to_string()))?;
+        Ok(FooData { age, name })
+    }
+
+    async fn write(data: FooData, path: &PathBuf) -> Result<(), DataWriteError> {
+        let content = format!("{}={}", data.name, data.age);
+        tokio::fs::write(path, content)
+            .await
+            .map_err(|e| DataWriteError::IoError(e))?;
+        Ok(())
+    }
+
+    fn test_data() -> FooData {
+        FooData {
+            age: 24,
+            name: "OneOneFourFiveOneFour".to_string(),
+        }
+    }
+
+    fn verify_data(data_a: FooData, data_b: FooData) -> bool {
+        ensure_eq!(data_a.age, data_b.age);
+        ensure_eq!(data_a.name, data_b.name);
+        return true;
+    }
+}